Against an enemy with signal jamming capability remote operation is not a given. Plus tanks communicate in real time with infantry/other elements. The lag introduced by remote operation/communication would be a serious hindrance even if everything was working, which it often isn't. Tanks have to respond in real time, they don't have the luxury of seconds of delay like say an orbiting drone. There's also the case of not wanting disabled tanks to fall into the hands of the enemy. Short of rigging the tanks with a self-destruct system (which would likely just make them explode more easily when hit), you need soldiers to do that.
Keep in mind that anything operating in battlefield conditions must be resilient. The entire situation is a constant stream of edge cases.
Also, don't look to Russia in Ukraine for an example of how tanks are used. Tanks are generally not meant to act alone. Either they're operating with a lot of other tanks, substantial supporting infantry, or both.
Russia does, indeed, have many issues wrt tank/infantry comms. Not even because they get jammed, but rather because they often don't have working comms at all, or because tank and infantry radios use incompatible frequencies or digital encoding. Much of the army's communication gear is from 1970-80s, poorly maintained, and often without spare parts to repair it if it's not working. In theory, there were new gadgets adopted into service that should have fixed it... but, as with many other things, there are too few of them, and the ones that are there have teething problems.
There's a guy who has been fighting on the Russian separatist side since 2014, who is responsible for comms and drones in his unit. He regularly makes long-winded posts about the specific issues that they face, and he had posted about tank/infantry comms several times, even before the all-out war:
The guy discusses both the LDNR militia and the Russian military, since he has seen both in the field, and not just this year - to remind, Russia already invaded Ukraine directly back in 2014 to stop the Ukrainian offensive when separatists failed to hold on their own; it just didn't advertise that fact back then.
The title of the second blog post that I've linked to is literally, "The story of how comms (and UAVs) were stolen from the Russian army".
Is is an issue for airborne drones. And signal jamming isn't the only concern. Long-range drones mostly rely on communications satellite relays for remote piloting. In a major conflict with a near-peer adversary, those satellites will be the first casualties.
That's one of the main reasons why the US military continues to spend heavily on manned tactical aircraft. The Air Force is actually decommissioning some MQ-9 and MQ-4 drones in order to free up funds for purchasing more 5th and 6th generation manned fighters. Airborne drones will continue to play a role, but until we make some major leaps in AI they will only be able to handle very limited missions.
Keep in mind that anything operating in battlefield conditions must be resilient. The entire situation is a constant stream of edge cases.
Also, don't look to Russia in Ukraine for an example of how tanks are used. Tanks are generally not meant to act alone. Either they're operating with a lot of other tanks, substantial supporting infantry, or both.
There are tons of other reasons as well, The Chieften, a former Tanker, has a good video on the subject: https://www.youtube.com/watch?v=lI7T650RTT8